Display device having a touch panel with auxiliary lines supplying supplemental auxiliary drive signals

Patent metadata

Field	Value
Publication number	US-9274639-B2
Application number	US-201514710341-A
Country	US
Kind code	B2
Filing date	May 12, 2015
Priority date	Jul 24, 2014
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A touch display device comprises a controller to generate a touch sync signal for controlling timing of a touch sensing period and a display period. A touch panel has a plurality of touch electrodes in a display area of the touch display device. The touch panel generates touch sensing signals indicating whether or not a touch occurs during the touch sensing period. A gate driver supplies gate pulses to gate lines of the touch panel during the display period and supplies a gate line auxiliary drive signal from the first transfer line onto the gate lines during the touch sensing period that mimics the touch drive signal. One or more auxiliary lines supply a supplemental auxiliary drive signal during the touch sensing period that mimics the touch drive signal.

First claim

What is claimed is:

1. A touch display device, comprising:
a controller to generate a touch sync signal for controlling timing of a touch sensing period and a display period in each of a plurality of frames, the touch sensing period and the display period alternating with each other;
a touch panel having a plurality of touch electrodes in a display area of the touch display device, the touch panel to generate touch sensing signals indicating whether or not a touch occurs during the touch sensing period;
a touch sensing circuit to supply a touch drive signal to the plurality of touch electrodes during the touch sensing period and to detect if the touch occurred based on the touch sensing signals;
a gate driver to supply gate pulses to gate lines of the touch panel during the display period to activate respective rows of pixels to receive pixel data, the gate driver to supply the gate pulses by switching between driving a gate-off voltage from a gate-off voltage supply line onto the gate lines and driving a gate-on voltage from a gate-on voltage supply line onto the gate lines, the gate driver further to supply a gate line auxiliary drive signal from the gate-off voltage supply line onto the gate lines during the touch sensing period, the gate line auxiliary drive signal mimicking the touch drive signal;
a first auxiliary line adjacent to the gate-off voltage supply line on a first side of the gate-off voltage supply line and a second auxiliary line adjacent to the gate-off voltage supply line on a second side of the gate-off voltage supply line opposite the first side, the first and second auxiliary lines formed at least in part on a same layer as the gate-off voltage supply line, the first and second auxiliary lines to supply a supplemental auxiliary drive signal during the touch sensing period, the supplemental auxiliary drive signal mimicking the touch drive signal.

2. The touch display device of claim 1 , wherein the gate-on voltage supply line supplies the gate-on voltage during the touch sensing period.

3. The touch display device of claim 1 , wherein the gate line auxiliary drive signal and the supplemental auxiliary drive signal each have an approximately same signal level and approximately same phase as the touch drive signal during the touch sensing period.

4. The touch display device of claim 1 , further comprising:
a data driver to provide data voltages representing pixel data to data lines of the touch panel during the display period and to supply a data line auxiliary drive signal onto the data lines during the touch sensing period, the data line auxiliary drive signal mimicking the touch drive signal.

5. The touch display device of claim 1 , wherein the gate-on voltage supply line is adjacent to at least one of the first and second auxiliary lines.

6. The touch display device of claim 1 , the touch display device further comprising:
a transfer line adjacent to the first auxiliary line on an opposite side of the first auxiliary line from the gate-off voltage supply line, the transfer line supplying a DC supply voltage to the touch display device during the display period and the touch sensing period; and
wherein the gate-on voltage supply line is adjacent to the second auxiliary line on an opposite side of the second auxiliary line from the gate-off voltage supply line.

7. The touch display device of claim 1 , wherein the first and second auxiliary lines comprise first and second multilayer lines respectively having an upper line and a lower line on different layers of the touch panel.

8. The touch display device of claim 7 , wherein the upper line is on a same layer as the touch electrodes and wherein the lower line is on a same layer as the gate lines.

9. A method for operating a touch display device, the method comprising:
generating, by a controller, a touch sync signal for controlling timing of a touch sensing period and a display period in each of a plurality of frames, the touch sensing period and the display period alternating with each other;
supplying, by a touch sensing circuit, a touch drive signal to a plurality of touch electrodes in a display area of a touch panel during the touch sensing period;
supplying, by a gate driver during the display period, gate pulses to gate lines of the touch panel to activate respective rows of pixels to receive pixel data, the gate driver supplying the gate pulses by switching between driving a gate-off voltage from a gate-off voltage supply line onto the gate lines and driving a gate-on voltage from a gate-on voltage supply line onto the gate lines;
supplying, by the gate driver during the touch sensing period, a gate line auxiliary drive signal from the gate-off voltage supply line onto the gate lines, the gate line auxiliary drive signal mimicking the touch drive signal;
providing during the touch sensing period, a supplemental auxiliary drive signal mimicking the touch drive signal on a first auxiliary line adjacent to the gate-off voltage supply line of a first side of the gate-off voltage supply line and on a second auxiliary line adjacent to the gate-off voltage supply line on a second side of the gate-off voltage supply line opposite the first side, the first and second auxiliary lines formed at least in part on a same layer as the gate-off voltage supply line;
generating, by the touch panel, touch sensing signals indicating whether or not a touch occurred during the touch sensing period; and
detecting, by the touch sensing circuit, if the touch occurred during the touch sensing period based on the touch sensing signals.

10. The method of claim 9 , further comprising:
supplying the gate-on voltage on the gate-on voltage supply line during the touch sensing period.

11. The method of claim 9 , further comprising:
supplying by a data driver during the touch sensing period, a data line auxiliary drive signal onto the data lines, the data line auxiliary drive signal mimicking the touch drive signal.

12. The method of claim 9 , wherein the first and second auxiliary lines respectively comprise first and second multilayer lines each having an upper line and a lower line on different layers of the touch panel, and wherein providing the supplemental auxiliary drive signal comprises:
providing the supplemental auxiliary drive signal on the first and second multilayer lines.

Assignees

• Lg Display Co Ltd

Inventors

• Park Yong-Chan
• Kim Ju-Han
• Kim Sung-Chul
• Kim Hoon-Bae

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/04184

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title